Chris Morgan has tracked large predators in some of the wildest and most remote places on Earth. He now embarks on his greatest challenge - to find and film the Siberian tiger living wild and free in Russia's far eastern forests. This film features the work of Korean cameraman, Sooyong Park, who spent two years in the forest tracking and filming the world's biggest cat. Park's tracking technique was very unconventional. He dug himself into an underground pit and, incredibly, waited there for weeks at a time, hoping for a glimpse of a wild tiger. Morgan adopts the same method while he shares with us firsthand the difficulty of seeing the rare Siberian tiger.